What is the magic behind that DOT which makes Fiddler work?

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+3 Q:

What is the magic behind that DOT which makes Fiddler work?

It took me a while to learn that I have to put a dot after the "localhost" in the URL so that I can use fiddler with my development server.

Why do I need to put this dot here to make fiddler work for my local:

http://localhost.:1888/MyPage.aspx

What does it stand for?

thanks

+8 A:

It's not that you're making fiddler work, but you're making Internet Explorer work. Internet Explorer is written specifically to not allow "localhost" as a proxy server. By attaching a trailing dot, you're providing a valid DNS name that does not match the mechanism within IE that checks the domain (IE does a stricmp(userdata, "localhost") or equivalant).

atk 2009-11-20 15:43:23

Yup. You could set the HookWithPAC registry key as an alternative to sticking the dot after localhost, because when a PAC script is used instead of a direct proxy registration, LOCALHOST requests are eligible for proxying. http://stackoverflow.com/questions/1577772/force-visual-studio-to-start-development-server-using-the-hostname-localhost-wi

EricLaw -MSFT- 2009-11-21 13:49:51

More info on: http://www.fiddler2.com/fiddler/help/hookup.asp as well. You can check the tıtle: "Why don't I see traffic sent to http://localhost or http://127.0.0.1?"

burak ozdogan 2009-11-30 08:57:43

localhost. just makes the hostname visible to Fiddler; otherwise, IE bypasses proxies.

You can also substitute "ipv4.fiddler" for "localhost" -- which can help prevent confusion, since the dot is easy to miss.

RickNZ 2009-11-23 01:44:17

ansaurus

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What is the magic behind that DOT which makes Fiddler work?

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